void IColumnChangingObserver.Handle(DemoDataRow row, ColumnChangedArgs columnChangedArgs)
{
if(ContainsInvalidCharacters(columnChangedArgs.NewValue))
{
Console.WriteLine("The newValue {0} has invalid characters changed rejected", columnChangedArgs.NewValue);
columnChangedArgs.CancelEvent = true;
}
}
protected bool PublishChangingEvent( string columnName, string oldValue, string newValue)
{
bool cancelled = false;
for(int i = 0; i < _changingObservers.Count; i++)
{
ColumnChangedArgs columnChangedArgs = new ColumnChangedArgs
{
CancelEvent = false,
ColumnName = columnName,
NewValue = newValue,
OldValue = oldValue
};
_changingObservers[i].Handle(this, columnChangedArgs);
if(columnChangedArgs.CancelEvent)
{
cancelled = true;
}
}
return cancelled;
}
protected void PublishChangedEvent(string columnName, string oldValue, string newValue)
{
for (int i = 0; i < _changedObservers.Count; i++)
{
ColumnChangedArgs columnChangedArgs = new ColumnChangedArgs
{
CancelEvent = false,
ColumnName = columnName,
NewValue = newValue,
OldValue = oldValue
};
_changedObservers[i].Handle(this, columnChangedArgs);
}
}
void OnColumnDeleted(DemoDataRow row, ColumnChangedArgs columnChangedArgs)
{
Console.WriteLine("The following column: {0} with the value: {1} was deleted.", columnChangedArgs.ColumnName, columnChangedArgs.OldValue);
}
void IColumnChangedObserver.Handle(DemoDataRow row, ColumnChangedArgs columnChangedArgs)
{
Console.WriteLine("Data was changed as follows: Column Name: {0} Changed From: {1} To: {2}",
columnChangedArgs.ColumnName, columnChangedArgs.OldValue, columnChangedArgs.NewValue);
}